<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>梦幻西游</title>
</head>
<style>
    *
    {
        padding: 0;
        margin: 0;
    }
    html,body{
        height: 100%;
    }
    .back{
        height: 100%;
        background-image: url();
        width: 3920px;
        margin-left: -2000px;
        animation: back_move 3s infinite linear;
    }
    @keyframes back_move{
        from{
            margin-left: -2000px;
        }
        to{
            margin-left: 0;
        }
    }
</style>
<body>
    <!-- 背景图 -->
    <div class="back"></div>
    <!-- 人的容器 -->
    <div class="wrap"></div>
</body>
</html>